We won't survive. Underground or otherwise. If we detonate enough weapons to reach nuclear winter it will endure long enough that humans will be extinct.

There is, however, good news. Cockroaches may survive. At least there may be life.

Mankind has been through ice ages before. Civilization has not.

I can see NK launching one attack and the child insisting an all-out response, hit em with everything.After which Russia and China launch on us calculating on diminished to no retaliation.

When we got stuck in 2 wars not so long ago it bled the middle class badly and kept us from taking more war on. There's more to international relations than charging around like a bull in an arena getting ready for barbeque.

Russia and China are not attacking us over retaliation to a north korean attack. We fight proxy wars now. Even if we launched a premptive attack i doubt there would be direct attacks. There's just too much money at stake.

If we launched a pre-emptive strike i think a Russia would use it as cover for what it wants to do in eastern europe, and China would use it as cover for what it wants to do/is doing in the China sea. Tibet and Tiwann would probably also be on the table.

I don't think the wars had any effect on the middle class, what is your evidence? The middle class was affected by the housing collapse, not war. Not an argument that war is good, but i'm not seeing the connection you are making.

Where do you think that NK got nuke and missile tech from, missiles even?The Russian and Chinese Navies are conducting joint maneuvers too.

Those guys had waves of 1000's according to mid-80's Scientific American article on Star Wars. With 10,000 satellites you can cover everywhere with at least 1 satellite at all times.1 satellite can take out maybe 5 missiles and the expected waves were 2000 to 8000 missiles.

Even if it's "just" 100's per wave, the poison will be widespread.Where people can live, they won't be friendly to strangers.

Ice Age - sunlight reaches the surface of the plant. Nuclear Winter - sunlight does not reach the surface of the planet. Ice Age - even if it is colder than normal there is still a warm season (summer). Nuclear Winter - no sunlight means no summer. And, the last estimate I read has a Nuclear Winter lasting ~40,000 years.